Kid genius Billy Blaze aka Commander Keen returns. This time, aliens called the Bloogs have kidnapped his baby sitter Molly and want to have her for dinner. Keen flies to the planet Fribbulus Xax to rescue her. Keen 6 uses the same graphics engine as parts 4 and 5, but has 15 new levels. This is the first commercial Keen episode released in a box instead of it being shareware.